3 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
4 * extra sysfs attribute from DRM. Normal drm_sysfs_class
5 * does not allow adding attributes.
7 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
9 * Copyright (c) 2003-2004 IBM Corp.
11 * This file is released under the GPLv2
15 #include <linux/device.h>
16 #include <linux/kdev_t.h>
17 #include <linux/gfp.h>
18 #include <linux/err.h>
19 #include <linux/export.h>
21 #include <drm/drm_sysfs.h>
22 #include <drm/drm_core.h>
24 #include "drm_internal.h"
26 #define to_drm_minor(d) dev_get_drvdata(d)
27 #define to_drm_connector(d) dev_get_drvdata(d)
29 static struct device_type drm_sysfs_device_minor = {
33 struct class *drm_class;
36 * __drm_class_suspend - internal DRM class suspend routine
37 * @dev: Linux device to suspend
38 * @state: power state to enter
40 * Just figures out what the actual struct drm_device associated with
41 * @dev is and calls its suspend hook, if present.
43 static int __drm_class_suspend(struct device *dev, pm_message_t state)
45 if (dev->type == &drm_sysfs_device_minor) {
46 struct drm_minor *drm_minor = to_drm_minor(dev);
47 struct drm_device *drm_dev = drm_minor->dev;
49 if (drm_minor->type == DRM_MINOR_LEGACY &&
50 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
51 drm_dev->driver->suspend)
52 return drm_dev->driver->suspend(drm_dev, state);
58 * drm_class_suspend - internal DRM class suspend hook. Simply calls
59 * __drm_class_suspend() with the correct pm state.
60 * @dev: Linux device to suspend
62 static int drm_class_suspend(struct device *dev)
64 return __drm_class_suspend(dev, PMSG_SUSPEND);
68 * drm_class_freeze - internal DRM class freeze hook. Simply calls
69 * __drm_class_suspend() with the correct pm state.
70 * @dev: Linux device to freeze
72 static int drm_class_freeze(struct device *dev)
74 return __drm_class_suspend(dev, PMSG_FREEZE);
78 * drm_class_resume - DRM class resume hook
79 * @dev: Linux device to resume
81 * Just figures out what the actual struct drm_device associated with
82 * @dev is and calls its resume hook, if present.
84 static int drm_class_resume(struct device *dev)
86 if (dev->type == &drm_sysfs_device_minor) {
87 struct drm_minor *drm_minor = to_drm_minor(dev);
88 struct drm_device *drm_dev = drm_minor->dev;
90 if (drm_minor->type == DRM_MINOR_LEGACY &&
91 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
92 drm_dev->driver->resume)
93 return drm_dev->driver->resume(drm_dev);
98 static const struct dev_pm_ops drm_class_dev_pm_ops = {
99 .suspend = drm_class_suspend,
100 .resume = drm_class_resume,
101 .freeze = drm_class_freeze,
104 static char *drm_devnode(struct device *dev, umode_t *mode)
106 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
109 static CLASS_ATTR_STRING(version, S_IRUGO,
111 __stringify(CORE_MAJOR) "."
112 __stringify(CORE_MINOR) "."
113 __stringify(CORE_PATCHLEVEL) " "
117 * drm_sysfs_init - initialize sysfs helpers
119 * This is used to create the DRM class, which is the implicit parent of any
120 * other top-level DRM sysfs objects.
122 * You must call drm_sysfs_destroy() to release the allocated resources.
124 * Return: 0 on success, negative error code on failure.
126 int drm_sysfs_init(void)
130 drm_class = class_create(THIS_MODULE, "drm");
131 if (IS_ERR(drm_class))
132 return PTR_ERR(drm_class);
134 drm_class->pm = &drm_class_dev_pm_ops;
136 err = class_create_file(drm_class, &class_attr_version.attr);
138 class_destroy(drm_class);
143 drm_class->devnode = drm_devnode;
148 * drm_sysfs_destroy - destroys DRM class
150 * Destroy the DRM device class.
152 void drm_sysfs_destroy(void)
154 if (IS_ERR_OR_NULL(drm_class))
156 class_remove_file(drm_class, &class_attr_version.attr);
157 class_destroy(drm_class);
162 * Connector properties
164 static ssize_t status_store(struct device *device,
165 struct device_attribute *attr,
166 const char *buf, size_t count)
168 struct drm_connector *connector = to_drm_connector(device);
169 struct drm_device *dev = connector->dev;
170 enum drm_connector_status old_status;
173 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
177 old_status = connector->status;
179 if (sysfs_streq(buf, "detect")) {
180 connector->force = 0;
181 connector->status = connector->funcs->detect(connector, true);
182 } else if (sysfs_streq(buf, "on")) {
183 connector->force = DRM_FORCE_ON;
184 } else if (sysfs_streq(buf, "on-digital")) {
185 connector->force = DRM_FORCE_ON_DIGITAL;
186 } else if (sysfs_streq(buf, "off")) {
187 connector->force = DRM_FORCE_OFF;
191 if (ret == 0 && connector->force) {
192 if (connector->force == DRM_FORCE_ON ||
193 connector->force == DRM_FORCE_ON_DIGITAL)
194 connector->status = connector_status_connected;
196 connector->status = connector_status_disconnected;
197 if (connector->funcs->force)
198 connector->funcs->force(connector);
201 if (old_status != connector->status) {
202 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
205 old_status, connector->status);
207 dev->mode_config.delayed_event = true;
208 if (dev->mode_config.poll_enabled)
209 schedule_delayed_work(&dev->mode_config.output_poll_work,
213 mutex_unlock(&dev->mode_config.mutex);
215 return ret ? ret : count;
218 static ssize_t status_show(struct device *device,
219 struct device_attribute *attr,
222 struct drm_connector *connector = to_drm_connector(device);
224 return snprintf(buf, PAGE_SIZE, "%s\n",
225 drm_get_connector_status_name(connector->status));
228 static ssize_t dpms_show(struct device *device,
229 struct device_attribute *attr,
232 struct drm_connector *connector = to_drm_connector(device);
235 dpms = READ_ONCE(connector->dpms);
237 return snprintf(buf, PAGE_SIZE, "%s\n",
238 drm_get_dpms_name(dpms));
241 static ssize_t enabled_show(struct device *device,
242 struct device_attribute *attr,
245 struct drm_connector *connector = to_drm_connector(device);
247 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
251 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
252 struct bin_attribute *attr, char *buf, loff_t off,
255 struct device *connector_dev = container_of(kobj, struct device, kobj);
256 struct drm_connector *connector = to_drm_connector(connector_dev);
260 if (!connector->edid_blob_ptr)
263 edid = connector->edid_blob_ptr->data;
264 size = connector->edid_blob_ptr->length;
271 if (off + count > size)
273 memcpy(buf, edid + off, count);
278 static ssize_t modes_show(struct device *device,
279 struct device_attribute *attr,
282 struct drm_connector *connector = to_drm_connector(device);
283 struct drm_display_mode *mode;
286 list_for_each_entry(mode, &connector->modes, head) {
287 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
289 written += snprintf(buf + written, PAGE_SIZE - written,
291 mode->hdisplay, mode->vdisplay,
292 interlaced ? "i" : "p",
293 drm_mode_vrefresh(mode));
299 static ssize_t mode_show(struct device *device,
300 struct device_attribute *attr,
303 struct drm_connector *connector = to_drm_connector(device);
304 struct drm_display_mode *mode;
305 struct drm_crtc_state *crtc_state;
309 if (!connector->state || !connector->state->crtc)
312 crtc_state = connector->state->crtc->state;
316 mode = &crtc_state->mode;
318 interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
319 written += snprintf(buf + written, PAGE_SIZE - written,
321 mode->hdisplay, mode->vdisplay,
322 interlaced ? "i" : "p",
323 drm_mode_vrefresh(mode));
328 static ssize_t tv_subconnector_show(struct device *device,
329 struct device_attribute *attr,
332 struct drm_connector *connector = to_drm_connector(device);
333 struct drm_device *dev = connector->dev;
334 struct drm_property *prop;
335 uint64_t subconnector;
338 prop = dev->mode_config.tv_subconnector_property;
340 DRM_ERROR("Unable to find subconnector property\n");
344 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
348 return snprintf(buf, PAGE_SIZE, "%s",
349 drm_get_tv_subconnector_name((int)subconnector));
352 static ssize_t tv_select_subconnector_show(struct device *device,
353 struct device_attribute *attr,
356 struct drm_connector *connector = to_drm_connector(device);
357 struct drm_device *dev = connector->dev;
358 struct drm_property *prop;
359 uint64_t subconnector;
362 prop = dev->mode_config.tv_select_subconnector_property;
364 DRM_ERROR("Unable to find select subconnector property\n");
368 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
372 return snprintf(buf, PAGE_SIZE, "%s",
373 drm_get_tv_select_name((int)subconnector));
376 static ssize_t dvii_subconnector_show(struct device *device,
377 struct device_attribute *attr,
380 struct drm_connector *connector = to_drm_connector(device);
381 struct drm_device *dev = connector->dev;
382 struct drm_property *prop;
383 uint64_t subconnector;
386 prop = dev->mode_config.dvi_i_subconnector_property;
388 DRM_ERROR("Unable to find subconnector property\n");
392 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
396 return snprintf(buf, PAGE_SIZE, "%s",
397 drm_get_dvi_i_subconnector_name((int)subconnector));
400 static ssize_t dvii_select_subconnector_show(struct device *device,
401 struct device_attribute *attr,
404 struct drm_connector *connector = to_drm_connector(device);
405 struct drm_device *dev = connector->dev;
406 struct drm_property *prop;
407 uint64_t subconnector;
410 prop = dev->mode_config.dvi_i_select_subconnector_property;
412 DRM_ERROR("Unable to find select subconnector property\n");
416 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
420 return snprintf(buf, PAGE_SIZE, "%s",
421 drm_get_dvi_i_select_name((int)subconnector));
424 static DEVICE_ATTR_RW(status);
425 static DEVICE_ATTR_RO(enabled);
426 static DEVICE_ATTR_RO(dpms);
427 static DEVICE_ATTR_RO(modes);
428 static DEVICE_ATTR_RO(mode);
430 static struct attribute *connector_dev_attrs[] = {
431 &dev_attr_status.attr,
432 &dev_attr_enabled.attr,
434 &dev_attr_modes.attr,
439 static DEVICE_ATTR_RO(tv_subconnector);
440 static DEVICE_ATTR_RO(tv_select_subconnector);
442 static struct attribute *connector_tv_dev_attrs[] = {
443 &dev_attr_tv_subconnector.attr,
444 &dev_attr_tv_select_subconnector.attr,
448 static DEVICE_ATTR_RO(dvii_subconnector);
449 static DEVICE_ATTR_RO(dvii_select_subconnector);
451 static struct attribute *connector_dvii_dev_attrs[] = {
452 &dev_attr_dvii_subconnector.attr,
453 &dev_attr_dvii_select_subconnector.attr,
457 /* Connector type related helpers */
458 static int kobj_connector_type(struct kobject *kobj)
460 struct device *dev = kobj_to_dev(kobj);
461 struct drm_connector *connector = to_drm_connector(dev);
463 return connector->connector_type;
466 static umode_t connector_is_dvii(struct kobject *kobj,
467 struct attribute *attr, int idx)
469 return kobj_connector_type(kobj) == DRM_MODE_CONNECTOR_DVII ?
473 static umode_t connector_is_tv(struct kobject *kobj,
474 struct attribute *attr, int idx)
476 switch (kobj_connector_type(kobj)) {
477 case DRM_MODE_CONNECTOR_Composite:
478 case DRM_MODE_CONNECTOR_SVIDEO:
479 case DRM_MODE_CONNECTOR_Component:
480 case DRM_MODE_CONNECTOR_TV:
487 static struct bin_attribute edid_attr = {
494 static struct bin_attribute *connector_bin_attrs[] = {
499 static const struct attribute_group connector_dev_group = {
500 .attrs = connector_dev_attrs,
501 .bin_attrs = connector_bin_attrs,
504 static const struct attribute_group connector_tv_dev_group = {
505 .attrs = connector_tv_dev_attrs,
506 .is_visible = connector_is_tv,
509 static const struct attribute_group connector_dvii_dev_group = {
510 .attrs = connector_dvii_dev_attrs,
511 .is_visible = connector_is_dvii,
514 static const struct attribute_group *connector_dev_groups[] = {
515 &connector_dev_group,
516 &connector_tv_dev_group,
517 &connector_dvii_dev_group,
522 * drm_sysfs_connector_add - add a connector to sysfs
523 * @connector: connector to add
525 * Create a connector device in sysfs, along with its associated connector
526 * properties (so far, connection status, dpms, mode list & edid) and
527 * generate a hotplug event so userspace knows there's a new connector
530 int drm_sysfs_connector_add(struct drm_connector *connector)
532 struct drm_device *dev = connector->dev;
538 device_create_with_groups(drm_class, dev->primary->kdev, 0,
539 connector, connector_dev_groups,
540 "card%d-%s", dev->primary->index,
542 DRM_DEBUG("adding \"%s\" to sysfs\n",
545 if (IS_ERR(connector->kdev)) {
546 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
547 return PTR_ERR(connector->kdev);
550 /* Let userspace know we have a new connector */
551 drm_sysfs_hotplug_event(dev);
557 * drm_sysfs_connector_remove - remove an connector device from sysfs
558 * @connector: connector to remove
560 * Remove @connector and its associated attributes from sysfs. Note that
561 * the device model core will take care of sending the "remove" uevent
562 * at this time, so we don't need to do it.
565 * This routine should only be called if the connector was previously
566 * successfully registered. If @connector hasn't been registered yet,
567 * you'll likely see a panic somewhere deep in sysfs code when called.
569 void drm_sysfs_connector_remove(struct drm_connector *connector)
571 if (!connector->kdev)
573 DRM_DEBUG("removing \"%s\" from sysfs\n",
576 device_unregister(connector->kdev);
577 connector->kdev = NULL;
581 * drm_sysfs_hotplug_event - generate a DRM uevent
584 * Send a uevent for the DRM device specified by @dev. Currently we only
585 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
586 * deal with other types of events.
588 void drm_sysfs_hotplug_event(struct drm_device *dev)
590 char *event_string = "HOTPLUG=1";
591 char *envp[] = { event_string, NULL };
593 DRM_DEBUG("generating hotplug event\n");
595 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
597 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
599 static void drm_sysfs_release(struct device *dev)
605 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
606 * @minor: minor to allocate sysfs device for
608 * This allocates a new sysfs device for @minor and returns it. The device is
609 * not registered nor linked. The caller has to use device_add() and
610 * device_del() to register and unregister it.
612 * Note that dev_get_drvdata() on the new device will return the minor.
613 * However, the device does not hold a ref-count to the minor nor to the
614 * underlying drm_device. This is unproblematic as long as you access the
615 * private data only in sysfs callbacks. device_del() disables those
616 * synchronously, so they cannot be called after you cleanup a minor.
618 struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
620 const char *minor_str;
624 if (minor->type == DRM_MINOR_CONTROL)
625 minor_str = "controlD%d";
626 else if (minor->type == DRM_MINOR_RENDER)
627 minor_str = "renderD%d";
629 minor_str = "card%d";
631 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
633 return ERR_PTR(-ENOMEM);
635 device_initialize(kdev);
636 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
637 kdev->class = drm_class;
638 kdev->type = &drm_sysfs_device_minor;
639 kdev->parent = minor->dev->dev;
640 kdev->release = drm_sysfs_release;
641 dev_set_drvdata(kdev, minor);
643 r = dev_set_name(kdev, minor_str, minor->index);
655 * drm_class_device_register - Register a struct device in the drm class.
657 * @dev: pointer to struct device to register.
659 * @dev should have all relevant members pre-filled with the exception
660 * of the class member. In particular, the device_type member must
664 int drm_class_device_register(struct device *dev)
666 if (!drm_class || IS_ERR(drm_class))
669 dev->class = drm_class;
670 return device_register(dev);
672 EXPORT_SYMBOL_GPL(drm_class_device_register);
674 void drm_class_device_unregister(struct device *dev)
676 return device_unregister(dev);
678 EXPORT_SYMBOL_GPL(drm_class_device_unregister);